124 MATHEMATICAL BIOPHYSICS OF THE CENTRAL NERVOUS SYSTEM 



Three-dimensional array of synapses, 



91 

 Three-receptor hypothesis, 91 

 Threshold, 3, 9, 10, 24, 38, 41, 43, 53, 

 61, 67, 104 



fluctuation of, 57 



fluctuations of, 53 



mean value of, 54 



modification of, 82 



variations in, 54, 55 

 Thresholds, 13, 17, 19, 57 



absolute, 65 

 Thurstone, L. L., 75 

 Time-unit, 31, 33 

 Total inhibition, 110 

 Total stimulation, 11 

 Total stimulus, 9 

 Transiently exciting neuron, 6 

 Transiently inhibitory neuron, 6 

 Transmission, 14 

 Transmitted impulse, interaction of, 



14 

 Trans-synaptic dynamics, 1 

 Trials, number of, 85, 88 

 Two-neuron chains, 79 

 Two-neuron circuit, 25 

 Two parallel chains with crossing in- 

 hibition, 64 



Unconditioned stimuli, 83 

 Unconditioned stimulus, 80, 81 

 Universal existential propositions, 109 

 Universal sentence, 109 

 Unpleasant response, 84 

 Unpleasant stimulus, 83 

 Unstable equilibrium, 24, 35 



Urban, F. M., 58, 59, 61 



Value, asymptotic, 7, 25 

 Variations in reaction-times, 55 

 Variations in Threshold, 55 

 Verhoeff, F. N., 98 

 Vertical disparities, 100 

 Vision 



binocular, 97 



monocular, 94 

 Visual axes, 97 

 Visual cues, 95 

 Visual data, 61, 68 

 Visual field, binocular, 98 

 Visual field rotation, 100 

 Visual illusions of shape, 13 

 Visual sensations, 68, 69, 70 

 Visual stimulus, 39 



Warning stimulus, 51, 52 

 Weber ratio, 42, 48, 68, 72 

 Weights 



discrimination of, 71 



lifted, 72 



discrimination of, 73 

 Williams, H. B., 114 

 Woodrow, H., 51, 52 

 "Wrong" judgments, 72 

 Wrong responses, 58, 61, 84, 86, 87 



probability of, 58, 84 



Young, G., 75 

 Young-Helmholtz theory, 90 



Zigler, M. J., 73 



